{"title":"Influences of wall materials on flow and thermal performance of S-CO2 at high pressure and heat flux","authors":"Yuan Ma , Gongnan Xie , Wujun Wang","doi":"10.1016/j.ijthermalsci.2025.109899","DOIUrl":null,"url":null,"abstract":"<div><div>Since supercritical carbon dioxide (S-CO<sub>2</sub>) systems usually have to work at both high temperature, high pressure and high heat flux, selecting appropriate solid materials is of great important to their system safety. In this study, the thermofluidic characteristics of supercritical carbon dioxide (S-CO<sub>2</sub>) in a horizontal rectangular channel have been investigated under high pressure and one-side-wall heated with high heat flux. Four different solid wall materials (253 MA, Inconel 617, Haynes 230 and Haynes 233) and three different heat flux values (1.5 MW/m<sup>2</sup>, 2.0 MW/m<sup>2</sup> and 2.5 MW/m<sup>2</sup>) are selected for analyzing the impacts of wall material and heat flux boundary conditions. The results showed that the maximum wall temperature difference of all four wall materials can generally exceed 100 K under the minimum heat flux, and can reach 500 K for Haynes 233 at the heat flux of 2.5 MW/m<sup>2</sup>. Considering the maximum allowable stress and creep characteristics, Inconel 617 has more obvious advantages as a solid material at the heat flux below 2 MW/m<sup>2</sup>, while Haynes 230 is a better choice at the heat flux beyond 2 MW/m<sup>2</sup> because of the stronger mechanical properties. By exploring the effect of inlet temperature, it is found that the inlet temperature close to the pseudo-critical temperature is conducive to flow and heat transfer. Taking the effect of buoyancy into account, it is shown that the temperature of the heating surface is decreased, the deterioration of heat transfer is weakened and occurs early, and the difference on the cross sections of the wall temperature decreases.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"214 ","pages":"Article 109899"},"PeriodicalIF":4.9000,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Thermal Sciences","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1290072925002224","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Since supercritical carbon dioxide (S-CO2) systems usually have to work at both high temperature, high pressure and high heat flux, selecting appropriate solid materials is of great important to their system safety. In this study, the thermofluidic characteristics of supercritical carbon dioxide (S-CO2) in a horizontal rectangular channel have been investigated under high pressure and one-side-wall heated with high heat flux. Four different solid wall materials (253 MA, Inconel 617, Haynes 230 and Haynes 233) and three different heat flux values (1.5 MW/m2, 2.0 MW/m2 and 2.5 MW/m2) are selected for analyzing the impacts of wall material and heat flux boundary conditions. The results showed that the maximum wall temperature difference of all four wall materials can generally exceed 100 K under the minimum heat flux, and can reach 500 K for Haynes 233 at the heat flux of 2.5 MW/m2. Considering the maximum allowable stress and creep characteristics, Inconel 617 has more obvious advantages as a solid material at the heat flux below 2 MW/m2, while Haynes 230 is a better choice at the heat flux beyond 2 MW/m2 because of the stronger mechanical properties. By exploring the effect of inlet temperature, it is found that the inlet temperature close to the pseudo-critical temperature is conducive to flow and heat transfer. Taking the effect of buoyancy into account, it is shown that the temperature of the heating surface is decreased, the deterioration of heat transfer is weakened and occurs early, and the difference on the cross sections of the wall temperature decreases.
期刊介绍:
The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review.
The fundamental subjects considered within the scope of the journal are:
* Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow
* Forced, natural or mixed convection in reactive or non-reactive media
* Single or multi–phase fluid flow with or without phase change
* Near–and far–field radiative heat transfer
* Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...)
* Multiscale modelling
The applied research topics include:
* Heat exchangers, heat pipes, cooling processes
* Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries)
* Nano–and micro–technology for energy, space, biosystems and devices
* Heat transport analysis in advanced systems
* Impact of energy–related processes on environment, and emerging energy systems
The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.